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arXiv 2010.01147astro-ph.GA
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来自LEGA-C的z $\sim$ 0.8处的粉尘衰减曲线:对斜率和2175 $Å$碰撞强度的精确约束

Dust Attenuation Curves at z $\sim$ 0.8 from LEGA-C: Precise Constraints on the Slope and 2175$Å$ Bump Strength

Ivana Barisic, Camila Pacifici, Arjen van der Wel, Caroline Straatman, Eric F. Bell, Rachel Bezanson, Gabriel Brammer, Francesco D'Eugenio, Marijn Franx, Josha … 展开作者

Ivana Barisic, Camila Pacifici, Arjen van der Wel, Caroline Straatman, Eric F. Bell, Rachel Bezanson, Gabriel Brammer, Francesco D'Eugenio, Marijn Franx, Josha van Houdt, Michael V. Maseda, Adam Muzzin, David Sobral, Po-Feng Wu

摘要:

基于VLT/VIMOS LEGA-C巡天的深源光谱和COSMOS领域的多波段测光,提出了一种新的方法,用M $_*$ $>$ 10 $^{10}$ M $_{\odot}$测量485个独立的恒星形成星系的衰减曲线。最重要的是,我们发现,在休息帧$3000-4500$ A范围内的衰减曲线通常几乎是银河系,LMC,SMC和Calzetti衰减曲线的两倍陡峭,这是在最近的研究中的集成光的现今星系。在$4500$ A的衰减和斜率与星系倾角密切相关:面对星系显示较少的衰减和陡峭的曲线相比,边缘上的星系,这表明几何效应占主导地位的衰减观察到的变化。我们的新方法产生了$2175$ A紫外碰撞检测260个单独的星系。尽管紫外线凸起强度和全球星系属性之间没有明显的相关性,但强烈的紫外线凸起最常出现在正面,低质量星系(10 $<$ log $_{10}$(M $_*$ /M $_{\odot}$)$<$ 10.5),整体衰减较低。最后,我们产生了一个典型的衰减曲线的恒星形成星系在$z\sim0.8$,这个处方代表的影响,尘埃的综合光谱能量分布的高红移星系更准确地比常用的衰减规律。

英文摘要:

We present a novel approach to measure the attenuation curves of 485 individual star-forming galaxies with M$_*$ $>$ 10$^{10}$ M$_{\odot}$ based on deep optical spectra from the VLT/VIMOS LEGA-C survey and multi-band photometry in the COSMOS field. Most importantly, we find that the attenuation curves in the rest-frame $3000-4500$A range are typically almost twice as steep as the Milky Way, LMC, SMC, and Calzetti attenuation curves, which is in agreement with recent studies of the integrated light of present-day galaxies. The attenuation at $4500$A and the slope strongly correlate with the galaxy inclination: face-on galaxies show less attenuation and steeper curves compared to edge-on galaxies, suggesting that geometric effects dominate observed variations in attenuation. Our new method produces $2175$A UV bump detections for 260 individual galaxies. Even though obvious correlations between UV bump strength and global galaxy properties are absent, strong UV bumps are most often seen in face-on, lower-mass galaxies (10 $<$ log$_{10}$(M$_*$/M$_{\odot}$) $<$ 10.5) with low overall attenuation. Finally, we produce a typical attenuation curve for star-forming galaxies at $z\sim0.8$; this prescription represents the effect of dust on the integrated spectral energy distributions of high-redshift galaxies more accurately than commonly used attenuation laws.

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